Problem 3: Analysis
We will now consider the concepts presented in each of the three
In sub-problem 3a,
we consider the special event-related traffic conditions that necessitate a
second look at the intersections during event traffic. In this analysis we
considered key concepts such as oversaturated conditions and demand volume.
Specifically, we analyzed traffic across multiple scenarios, where demand exceeds
capacity and arrivals from one scenario are served in the adjacent time
period. In this case, we are able to analyze a scenario that provides
an insight into oversaturated conditions. Where volume exceeds capacity, the
collection of demand volumes becomes critical to our analysis in order to
capture the effect of oversaturated conditions. This is a challenge that
requires significant investment in data collection.
In sub-problem 3b,
we utilize a simulation model to analyze the conditions. Our analysis using
the simulation model provides us with an opportunity to test a variety of
variables to determine the effect of specific measures and changes.
Finally, in sub-problem 3c,
the concept of critical movement analysis is used to exhibit another
methodology for determining whether an
intersection is at or near capacity.
The ability of a traffic signal
to handle fluctuations is a function of the signal timing that is in the
controller in the field. In time period 3 (4:30 - 4:45 pm) of our previous analysis, we changed
the green ratio slightly to serve the traffic at the post-game traffic at the
intersection. Would this green ratio be possible under the existing pre-timed
control? Take a few minutes to identify other
factors that you think should be considered in this analysis, and continue to
the next page when you are ready.
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